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符号三角形

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 4349    Accepted Submission(s): 1840


Problem Description
符号三角形的 第1行有n个由“+”和”-“组成的符号 ，以后每行符号比上行少1个，2个同号下面是”+“，2个异 号下面是”-“ 。计算有多少个不同的符号三角形，使其所含”+“ 和”-“ 的个数相同 。 n=7时的1个符号三角形如下:
+ + - + - + +
+ - - - - +
- + + + -
- + + -
- + -
- -
+
 

Input
每行1个正整数n <=24,n=0退出.
 

Output
n和符号三角形的个数.
 

Sample Input
15
16
19
20
0
 

Sample Output
15 1896
16 5160
19 32757
20 59984
 

Source
ECJTU 2008 Autumn Contest
 

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